did the vice president give critics an opening when he talked about a tax hike. let's listen. >> you know the phrase they always use? obama and biden want to raise taxes by a trillion dollars. guess what? yes, we do, in one regard. we want to let that $1 trillion tax cut expire so the middle class doesn't have to bear the burden of all the money going to the super-wealthy. >> does the vice president's style create a risk for the democratic ticket? >> he does. you know, it's something that they've been watching with joe biden for years, but joe biden has been preparing for an entire week. by thursday when the debate happens, he will have spent almost a week at his home in wilmington preparing. and when he is prepared, he is much better in that he doesn't make those same gaffes. when he nose what it is that he needs to say and he's not going off the cuff in this style, he does better. >> on thursday, joe biden went aggressively after governor romney on taxes. let's take a look at that. >> you just never know what game or what position governor romney's going to com